Declared in <mp-units/framework/quantity_point.h>
inline constexpr static
QuantitySpec auto _quantity_spec_ = []() {
// select the strongest of specs
if constexpr (detail::QuantityKindSpec<MP_UNITS_NONCONST_TYPE(QP.quantity_spec)>)
return QP.point_origin._quantity_spec_;
else
return QP.quantity_spec;
}();